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So far, you ve created the admin.php that you ll continue to develop in the rest of the chapter to allow the user to administer catalog data and the admin_login componentized template that contains the admin authentication and authorization functionality. All the fun begins in admin.php, which checks to see whether the visitor has been authenticated as administrator (by checking whether the admin_logged session variable is true). If the visitor is not logged in as administrator, the admin_login componentized template is loaded: // If admin is not logged, assign admin_login template to $pageContentsCell if (!(isset ($_SESSION['admin_logged'])) || $_SESSION['admin_logged'] != true) $pageContentsCell = 'admin_login.tpl'; The login mechanism in the AdminLogin helper class stores the current authentication state in the visitor s session under a variable named admin_logged. In the __construct function, we test whether the supplied username and password match the values stored in config.php as ADMIN_USERNAME and ADMIN_PASSWORD; if they match, we set the value of admin_logged to true and redirect to admin.php: // Verify if the correct username and password have been supplied if (isset ($_POST['submit'])) { if ($_POST['username'] == ADMIN_USERNAME && $_POST['password'] == ADMIN_PASSWORD) { $_SESSION['admin_logged'] = true; header('Location: admin.php');

} table.completeRow(); table.writeSelectedRows( 0, -1, 169, table.getTotalHeight() + 20, canvas); document.newPage(); } document.close(); } public PdfPCell getMonthCell(Calendar calendar, Locale locale) { PdfPCell cell = new PdfPCell(); cell.setColspan(7); cell.setBorder(PdfPCell.NO_BORDER); cell.setUseDescender(true); Paragraph p = new Paragraph( String.format(locale, "%1$tB %1$tY", calendar), bold); p.setAlignment(Element.ALIGN_CENTER); cell.addElement(p); return cell; }

2. In the tool tip that appears, the current filter and sort information is listed for the fields in the Row Labels area (see Figure 6-28).

exit; } else $this->mLoginMessage = 'Login failed. Please try again:'; } The logout link in admin_menu.tpl simply unsets the admin_logged session variable in admin.php and redirects the administrator to index.php. This way, on the next attempt to access the admin page, the administrator will be redirected to the login page. // If loggin out ... if (isset ($_GET['Page']) && ($_GET['Page'] == 'Logout')) { unset($_SESSION['admin_logged']); header('Location: admin.php'); exit; }

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public PdfPCell getDayCell(Calendar calendar, Locale locale) { Formats PdfPCell cell = new PdfPCell(); day cells cell.setCellEvent(cellBackground); if (isSunday(calendar) || isSpecialDay(calendar)) Formats cell.setCellEvent(roundRectangle); special day cells cell.setPadding(3); cell.setBorder(PdfPCell.NO_BORDER); Chunk chunk = new Chunk( String.format(locale, "%1$ta", calendar), small); chunk.setTextRise(8); Paragraph p = new Paragraph(chunk); p.add(new Chunk(new VerticalPositionMark())); p.add(new Chunk(String.format(locale, "%1$te", calendar), normal)); cell.addElement(p); return cell; }

After creating the table, you set the table event to draw the background of the table, and you make sure the default cells get a rounded rectangle as their border. B doesn t apply to the cell with the month C. The getMonthCell() method returns a PdfPCell object with the name of the month. B also doesn t apply to the cells created with getDayCell(). These cells get a white background with rounded corners D. Sundays and special days (holidays) get a colored border E. There s a similar mechanism that allows you to write custom functionality for Chunk, Paragraph, and and Section objects. The layout methods to achieve this are bundled in the PdfPageEvent interface.

The department administration section allows the client to add, remove, or change department information To implement this functionality, you ll need to write the necessary code for the presentation, business, and data layers One fundamental truth regarding n-Tiered applications (which also applies to this particular case) is that the business and data tiers are ultimately created to support the presentation tier Drawing on paper and establishing exactly how you want the site to look (in other words, what functionality needs to be supported by the UI) is a good indication of what the database and business tier will contain With the proper design work, you can know exactly what to place in each tier, so the order of writing the code doesn t matter.

When you add a basic building block to a Document instance, it s translated into PDF syntax and written to a PDF file by a PdfWriter object. In this process, there s an important class you ll hardly ever need to address directly: PdfDocument. This class is

After applying a filter to the row labels, you can remove it to show all the labels again. You ll remove the filter that you applied to the district labels: 1. Click the drop-down arrow in the Row Labels heading. 2. In the Select Field drop-down list, choose District. 3. Click Clear Filter from District (see Figure 6-29).

responsible for examining the high-level objects. It s the invisible rope tying the document to the writer. The PdfDocument class is also responsible for firing the page events defined by the PdfPageEvent interface. This interface has 11 methods that can be divided into two groups:

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